(a) Mechanism of nucleophilic addition reactions:
A nucleophile attacks the electrophilic carbon atom of the polar carbonyl group from a direction approximately perpendicular to the plane of sp2 hybridized orbitals of carbonyl carbon. The hybridization of carbon changes from sp2 to sp3 in this process and a tetrahedral intermediate is produced. The intermediate captures a proton from the medium to give the neutral product.
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(b) The hydrolysis of the given compound with dil H2SO4 to give a carboxylic acid and an alcohol suggests that the compound is an ester.
![](https://www.sarthaks.com/?qa=blob&qa_blobid=5729322275300088510)